Remove Python 2 remnants

Question

I'm in the process of removing Python 2 support for many of my projects and I'd like to remove the Python 2 cruft that has build up over the years. I'm talking, for example, about the

# -*- coding: utf-8 -*-

headers, the object specification in

class Foobar(object):
    # ...

or the imports from __future__ and six.

How can I best find/remove those things?

Answer 1

The pyupgrade tool does a great job of removing old cruft you no longer need. It supports upgrading to either Python 3+, 3.6+, or 3.7+, removing more and more cruft the newer version you can require.

The pyupgrade readme has an overview of what it fixes, which includes the coding header, the object superclass, unneeded __future__ imports, and many uses of the six library.

Notably, it does not remove the use of the future library.